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#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
#include <cctype>
class toUpper {public: char operator()(char c) const {return toupper(c);}};
bool isValidEmailCharacter(char c)
{
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <='9') ||
(c == '.') || (c == '-') || (c == '+'))
return true;
else
return false;
}
int main()
{
// declare constants
const string defaultInput = "fileContainingEmails.txt";
const string defaultOutput = "copyPasteMyEmails.txt";
// declare variables
string inputFileName;
string outputFileName;
ifstream fin;
ofstream fout;
// array list
const int MAX_EMAILS = 1000;
int nEmails = 0;
string email[MAX_EMAILS];
string line;
int s = 0;
int e = 0;
bool hasDot = false;
bool emailTaken = false;
string emailX;
string emailA;
string emailB;
string temp;
// prompt for input filename
cout << "Enter input filename [default: " << defaultInput << " ]: ";
getline(cin, inputFileName);
if (inputFileName == "")
{
inputFileName = defaultInput;
// prompt for output filename
cout << "Enter output filename [default: " << defaultOutput << " ]: ";
getline(cin, outputFileName);
if (outputFileName == "")
outputFileName = defaultOutput;
}
else
{
cout << "Enter output filename [default: " << inputFileName << " ]: ";
getline(cin, outputFileName);
if (outputFileName == "")
outputFileName = inputFileName;
}
cout << endl;
cout << "Input file = " << inputFileName << endl;
cout << "Output file = " << outputFileName << endl << endl;
fin.open(inputFileName.c_str());
if (!fin.good()) throw "I/O error";
while (fin.good())
{
getline(fin, line);
for (int i = 0; i < line.length(); i++)
{
if (line[i] == '@')
{
s = i;
while (s > 0 && isValidEmailCharacter(line[s-1]))
{
s--;
}
e = i;
hasDot = false;
while (e < line.length() && isValidEmailCharacter(line[e+1]))
{
if (line[e] == '.')
hasDot = true;
e++;
}
if (s < i && e > i && hasDot)
{
emailX = line.substr(s, e-s +1);
emailTaken = false;
emailA = emailX;
transform(emailA.begin(), emailA.end(), emailA.begin(), toUpper());
for (int i = 0; i < nEmails; i++)
{
emailB = email[i];
transform(emailB.begin(), emailB.end(), emailB.begin(), toUpper());
if (emailA == emailB) emailTaken = true;
}
if (!emailTaken && nEmails < MAX_EMAILS)
{
email[nEmails++] = emailX;
cout << emailX << endl;
}
}
}
}
}
cout << endl;
fin.close();
for (int i = 0; i < nEmails; i++)
{
for (int j = 0; j , nEmails; j++)
{
emailA = email[i];
emailB = email[j];
transform(emailA.begin(), emailA.end(), emailA.begin(), toUpper());
transform(emailB.begin(), emailB.end(), emailB.begin(), toUpper());
if (emailA < emailB)
{
temp = email[i];
email[i] = email[j];
email[j] = temp;
}
}
}
if (nEmails > 0)
{
fout.open(outputFileName.c_str());
if (!fout.good()) throw "I/O error";
for (int i = 0; i < nEmails; i++)
{
fout << email[i];
if ((i+1) < nEmails)
fout << "; ";
}
fout.close();
}
return 0;
}
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